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Efficient ex vivo reconstitution of fetal oocyte development in primates

Research Project

Project/Area Number 21K20740
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0802:Biomedical structure and function and related fields
Research InstitutionKyoto University

Principal Investigator

Mizuta Ken  京都大学, 医学研究科, 助教 (40909503)

Project Period (FY) 2021-08-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords生殖細胞 / 霊長類 / カニクイザル / 胎児 / 体外培養 / 卵母細胞 / 原始卵胞 / 減数分裂 / 再構成卵巣
Outline of Research at the Start

本研究の目的は、霊長類の始原生殖細胞を高効率に卵母細胞へ誘導する体外培養系の確立である。これまでの研究により、カニクイザルの始原生殖細胞を卵母細胞へ誘導する新規体外培養法の開発に成功したが、現状の培養法では誘導効率が非常に悪く、最適な培養条件ではないと考えられる。本研究で、より多くの卵母細胞を適切な培養期間で誘導できる条件を見いだし、より高度な体外培養系を確立することは、霊長類の雌性生殖細胞の発生機構の解明・ヒトの生殖細胞関連疾患の病因解明に関する研究の基盤になると考えられる。

Outline of Final Research Achievements

In this study, we aimed to improve existing methods for the ex vivo reconstitution of primate fetal oocyte development. Various culture conditions were examined using reaggregated ovaries (rOvaries) derived from cynomolgus monkey fetal ovarian cells. As a result, it was demonstrated that maintaining monkey rOvaries with the improved culture method significantly enhanced the efficiency of oogonia proliferation, oogonia-to-oocyte differentiation, and primordial follicle formation. The monkey oocyte-like cells obtained through the improved culture method exhibited histological characteristics and gene expression patterns highly similar to those of in vivo oocytes at all meiotic substages. Thus, the establishment of an efficient ex vivo reconstitution method of primate fetal oocyte development was successfully achieved.

Academic Significance and Societal Importance of the Research Achievements

本研究で開発した改良型培養法により、生体に近い効率でカニクイザル胎仔卵母細胞の発生過程を体外再構成することが可能となった。当培養法は、霊長類の多能性幹細胞から誘導した未熟な生殖細胞を試験管内で分化・成熟させる際の基盤技術となり、ヒトを含めた霊長類の雌性生殖細胞の発生機構の解明に繋がるものである。
生殖細胞は、遺伝情報の次世代への継承という、種の存続や進化において極めて重要な役割を担っている。よって、その発生機構の解明は、生物学的な知見の構築のみならず、その異常に起因する遺伝性疾患や不妊等のヒト疾患の病因解明・治療開発の推進に繋がると考えられ、医学的にも重要な研究成果である。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (12 results)

All 2023 2022 Other

All Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (4 results) (of which Int'l Joint Research: 1 results) Remarks (2 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Induction of fetal meiotic oocytes from embryonic stem cells in cynomolgus monkeys2023

    • Author(s)
      Gyobu‐Motani Sayuri、Yabuta Yukihiro、Mizuta Ken、Katou Yoshitaka、Okamoto Ikuhiro、Kawasaki Masanori、Kitamura Ayaka、Tsukiyama Tomoyuki、Iwatani Chizuru、Tsuchiya Hideaki、Tsujimura Taro、Yamamoto Takuya、Nakamura Tomonori、Saitou Mitinori
    • Journal Title

      The EMBO Journal

      Volume: - Issue: 9

    • DOI

      10.15252/embj.2022112962

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] ヒト生殖細胞の発生機構の解明とその試験管内再構成2023

    • Author(s)
      水田 賢, 加藤嘉崇, 大田浩, 斎藤通紀
    • Journal Title

      細胞

      Volume: 55 Pages: 16-19

    • Related Report
      2022 Annual Research Report
  • [Journal Article] ヒト胎児卵母細胞発生過程の体外再構成2023

    • Author(s)
      水田賢, 大田浩, 斎藤通紀
    • Journal Title

      医学のあゆみ

      Volume: 285 Pages: 155-156

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Nucleome programming is required for the foundation of totipotency in mammalian germline development2022

    • Author(s)
      Nagano Masahiro, Hu Bo, Yokobayashi Shihori et al.
    • Journal Title

      The EMBO Journal

      Volume: 41 Issue: 13

    • DOI

      10.15252/embj.2022110600

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] <i>Ex vivo</i> reconstitution of fetal oocyte development in humans and cynomolgus monkeys2022

    • Author(s)
      Mizuta Ken、Katou Yoshitaka、Nakakita Baku、Kishine Aoi、Nosaka Yoshiaki、Saito Saki、Iwatani Chizuru、Tsuchiya Hideaki、Kawamoto Ikuo、Nakaya Masataka、Tsukiyama Tomoyuki、Nagano Masahiro、Kojima Yoji、Nakamura Tomonori、Yabuta Yukihiro、Horie Akihito、Mandai Masaki、Ohta Hiroshi、Saitou Mitinori
    • Journal Title

      The EMBO Journal

      Volume: 41 Issue: 18

    • DOI

      10.15252/embj.2022110815

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Ex vivo reconstitution of fetal oocyte development in humans and cynomolgus monkeys2023

    • Author(s)
      Ken Mizuta
    • Organizer
      The 21st Takeda Science Foundation Symposium on Bioscience
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Ex vivo reconstitution of fetal oocyte development in humans and monkeys2022

    • Author(s)
      Ken Mizuta
    • Organizer
      The 26th ASHBi Colloquium
    • Related Report
      2022 Annual Research Report
  • [Presentation] ヒト及びカニクイザル胎児の卵母細胞発生過程の体外再構成2022

    • Author(s)
      水田 賢
    • Organizer
      第45回 日本分子生物学会年会 ワークショップ
    • Related Report
      2022 Annual Research Report
  • [Presentation] Ex vivo reconstitution of fetal oocyte development in humans and monkeys2022

    • Author(s)
      Mizuta K, Katou Y, Nakakita B, Iwatani C, Tsuchiya H, Ohta H, Saitou M
    • Organizer
      ASHBi Retreat 2022
    • Related Report
      2021 Research-status Report
  • [Remarks] ヒト・サルの胎児卵巣から原始卵胞を体外で作出することに成功

    • URL

      https://ashbi.kyoto-u.ac.jp/ja/news/20220729_research-result_saitou/

    • Related Report
      2022 Annual Research Report
  • [Remarks] New egg recipe to boost fertility research

    • URL

      https://ashbi.kyoto-u.ac.jp/news/https-20220729_research-result_saitou/

    • Related Report
      2022 Annual Research Report
  • [Patent(Industrial Property Rights)] 霊長類の胎児卵巣細胞から卵胞を誘導する体外培養法2022

    • Inventor(s)
      斎藤通紀 ,大田浩 ,水田賢
    • Industrial Property Rights Holder
      斎藤通紀 ,大田浩 ,水田賢
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2022-117665
    • Filing Date
      2022
    • Related Report
      2022 Annual Research Report

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Published: 2021-10-22   Modified: 2024-12-25  

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